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Abstract
A vibrating sample magnetometer (VSM) has been used to study the field-dependent magnetization, M(H), of the d5−d7 metal acetates [M(OAc)2.nH2O], metal β−diketonate complexes [M(tba)2(H2O)2] and the macromolecular polymers [M(tba)2(4,4-bipy)]n (where, M = Mn(II), Fe(II), and Co(II), OAc = O2CCH3, tba = deprotonated 3-benzoyl-1.1.1-trifluoroacetone, and 4,4-bipy = 4,4′-bipyridine). The magnetic field strength (H) was applied in the range of 0−104 Oe at ambient temperature (ca. 23°C). The experimental results showed that the d5−d7 metal acetate, complexes and polymers exhibit low paramagnetic properties excepting [Fe(tba)2(4,4-bipy)]n polymer, which had negative magnetization M(emu/g) showing diamagnetic properties in the range 0−104 Oe. The magnetization was almost equal to zero without an applied magnetic field (H(Oe)) for each d5−d7 metal acetate, complex, and polymer. The linear M(H) curve had a magnetic saturation for iron and manganese acetate species at the magnetic field strengths of 3.1 × 103 and 4.7 × 103 Oe, respectively. The external magnetic field reached 9.0 × 103 Oe without any saturation magnetization for the cobalt compounds. The coordination effect of 3-benzoyl-1.1.1-trifluoroacetone (H-tba) and 4,4′-bipyridine (4,4′-bipy) ligands on the field-dependent magnetization M(H) and paramagnetic behavior of d5−d7 metal atoms is discussed. The field-dependent magnetization M(H) curves of metal β−diketonate complexes and the polymers including d5−d7 metal acetates showed a weak field octahedral geometry.
Acknowledgments
The authors would like to thank Mu′tah University (Jordan) for the support needed for this research. We would like to extend my sincere thanks to Prof. P. Geil for his fruitful observations and suggestions.